Trump’s tariff formula has fancy Greek symbols. No one is sure why

President Donald Trump this week unleashed an economic hurricane by hitting dozens of countries with a punishing wave of tariffs. In order to explain the specific tariff imposed on any given country, the White House shared a sophisticated-looking formula that includes Greek letters commonly used by economists. The problem with this, as experts were quick to point out, is that the symbols don't appear to serve any purpose.

On Tuesday, a White House press secretary shared the formula on Twitter...